Schweitzer Engineering Laboratories Inc. (SEL) offers arc-flash detection (AFD) capability in the SEL-751A Feeder Protection Relay, providing automatic protection against dangerous arc-flash events. AFD interrupts power to the arc flash before it can cause severe personal injury, extensive equipment damage, and lengthy system outages. The SEL-751A AFD solution uses fiber-optic, arc-flash light sensors to detect the light produced by an arc-flash event. To prevent false tripping, the SEL-751A looks for an overcurrent that coincides with the light flash. When both conditions are met, the SEL-751A sends a trip signal to the circuit breaker in as fast as 2 ms. This fast tripping significantly reduces the damage-causing energy released by the arc-flash event. www.selinc.com/Arc-FlashSchweitzer Engineering Laboratories Inc.